A One-pot Approach to Ethyl 1,4,5-Triaryl-1<i>H</i>-pyrazole-3-carboxylates via an Improved Claisen Condensation-Knorr Reaction Sequence
作者:Jiaojiao Zhai、Chunhui Gu、Jianan Jiang、Shunli Zhang、Daohua Liao、Lei Wang、Dunru Zhu、Yafei Ji
DOI:10.1002/cjoc.201300776
日期:2013.12
one‐pot approach to ethyl 1,4,5‐triaryl‐1H‐pyrazole‐3‐carboxylates has been developed in moderate to high yields. The tert‐BuOLi‐mediated Claisen condensation of 1,2‐diarylethanones and ethyl oxalyl chloride efficiently provided the enolized lithium salts of ethyl 2,4‐dioxo‐3,4‐diarylbutanoates, which in situ reacted with arylhydrazine hydrochlorides via a hydrochloric acid‐promoted Knorr reaction to produce
One-Pot Synthesis of Highly Substituted 1<i>H</i>-Pyrazole-5-carboxylates from 4-Aryl-2,4-diketoesters and Arylhydrazines
作者:Jiao-Jiao Zhai、Chun-Hui Gu、Ying Guo、Dao-Hua Liao、Dun-Ru Zhu、Ya-Fei Ji
DOI:10.1002/jhet.2354
日期:2016.5
A one‐pot synthesis of highly substituted 1H‐pyrazole‐5‐carboxylates 1 has been developed starting from easily available 4‐aryl‐2,4‐diketoesters 2 and arylhydrazine hydrochlorides 3. More active 2‐carbonyl group of 2 was blocked with methoxyamine hydrochloride to give 2‐methoxy imine intermediates, which were then subjected to condensation cyclization with 3 in situ to provide the desired products
Cyclic Amine Compound and Use Thereof for the Prophylaxis or Treatment of Hypertension
申请人:Kuroita Takanobu
公开号:US20100121048A1
公开(公告)日:2010-05-13
The present invention relates to a compound represented by the formula: (I) wherein ring A is a 5- or 6-membered aromatic heterocycle optionally having substituent (s); U, V and W are each independently C or N, provided that when any one of U, V and W is N, then the others should be C; Ra and Rb are each independently a cyclic group optionally having substituent(s), a C
1-10
alkyl group optionally having substituent(s), a C
2-10
alkenyl group optionally having substituent(s), or a C
2-10
alkynyl group optionally having substituent(s); X is a bond, or a spacer having 1 to 6 atoms in the main chain; Y is a spacer having 1 to 6 atoms in the main chain; Rc is a hydrocarbon group optionally containing heteroatom(s) as the constituting atom(s), which optionally has substituent(s); m and n are each independently 1 or 2; and ring B optionally further has substituent(s), or a salt thereof. The compound of the present invention has excellent renin inhibitory activity, and thus is useful as an agent for the prophylaxis or treatment of hypertension, various organ damages attributable to hypertension, and the like.
Synthesis, crystal structure, property research, and DFT calculation of 2,3-diphenylfuro[3,2-b]quinoxaline
作者:Qi-Chao Yao、Ding-Er Wu、Min Xia
DOI:10.1016/j.molstruc.2013.03.044
日期:2013.6
electrochemical property are studied in detail. The unique herring-bone arrangement which is revealed by the X-ray crystallography should account for the intense solid-state fluorescence. The theoretic calculations are employed to clarify the origin of the large Stokes shift and the positive solvatochromism in view of the geometric relaxation and the transition feature.